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Cell Growth & Differentiation, Vol 5, Issue 1 55-60, Copyright © 1994 by American Association of Cancer Research


ARTICLES

All-trans-retinoic acid alters myc gene expression and inhibits in vitro progression in small cell lung cancer

GP Kalemkerian, RK Jasti, P Celano, BD Nelkin and M Mabry
Oncology Center, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231.

Transitions between the small cell lung cancer and the non-small cell lung cancer phenotype occur during clinical tumor progression in small cell lung cancer. We have previously developed a culture model which mimics these transitions. In our model, the insertion of the v-Ha-ras oncogene into c-myc overexpressing NCI-H82 small cell lung cancer cells induces features characteristic of non-small cell lung cancer. We now report that treatment of NCI-H82 cells with 1 microM all-trans-retinoic acid resulted in decreased cellular growth, decreased c-myc mRNA levels, and increased L-myc mRNA levels. Retinoic acid treatment prior to v-Ha-ras insertion also inhibited the typical ras-induced phenotypic transition seen in untreated NCI-H82 cells. In contrast, retinoic acid treatment of NCI-H82 ras cells after ras-induced transition to the non-small cell lung cancer phenotype did not affect cellular phenotype, nor c-myc or L-myc gene expression. These data show that all-trans-retinoic acid, a clinically relevant compound, inhibits small cell lung cancer progression in our in vitro model and alters the expression of the c-myc and L-myc oncogenes. These findings suggest mechanisms for the biological effects of retinoic acid in small cell lung cancer.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1994 by the American Association of Cancer Research.